Fix mask type choice in vectorizable_call (PR 89535)

Fix mask type choice in vectorizable_call (PR 89535)

This is another case in which we were failing to pass the expected
mask vector type to vect_get_vec_def_for_operand.

2019-02-28  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR tree-optimization/89535
	* tree-vect-stmts.c (vectorizable_call): Record the vector types
	for each operand.  Calculate the fallback choice for mask operands
	and pass it to vect_get_vec_def_for_operand.

gcc/testsuite/
	PR tree-optimization/89535
	* gfortran.dg/vect/pr89535.f90: New test.

From-SVN: r269308